US2575393A - Electron beam tube filter - Google Patents

Electron beam tube filter Download PDF

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Publication number
US2575393A
US2575393A US731232A US73123247A US2575393A US 2575393 A US2575393 A US 2575393A US 731232 A US731232 A US 731232A US 73123247 A US73123247 A US 73123247A US 2575393 A US2575393 A US 2575393A
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target
function
elements
time
vertical
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English (en)
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Liss C Peterson
Ralph K Potter
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AT&T Corp
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Bell Telephone Laboratories Inc
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Priority to FR959576D priority Critical patent/FR959576A/fr
Priority to NL138587D priority patent/NL138587B/xx
Priority to NL72729D priority patent/NL72729C/xx
Priority to BE480427D priority patent/BE480427A/xx
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US731232A priority patent/US2575393A/en
Priority to GB5095/48A priority patent/GB663851A/en
Priority to CH271241D priority patent/CH271241A/de
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H15/00—Transversal filters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/02—Cathode ray tubes; Electron beam tubes having one or more output electrodes which may be impacted selectively by the ray or beam, and onto, from, or over which the ray or beam may be deflected or de-focused
    • H01J31/06—Cathode ray tubes; Electron beam tubes having one or more output electrodes which may be impacted selectively by the ray or beam, and onto, from, or over which the ray or beam may be deflected or de-focused with more than two output electrodes, e.g. for multiple switching or counting
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0153—Electrical filters; Controlling thereof

Definitions

  • This invention relates to the modification of time-varying functions in accordance with pre- Selected patterns; more particularly, it relates to electrical transducers of the types which are known in the art as transversal filters.
  • the behavior of electrical networks can be specified in two ways representing two different physical points of view; Ordinarily, one thinks first of the well-known steady-state point of view which describes the network performance in a terms of'the concepts of amplitude and phase response versus frequency.
  • the time function viewpoint in which the network is described in terms of its amplitude-time response at l thereceiving end resulting from the application of an impulse of infinitesimal duration at the sending end.
  • Network response may thus be considered either in terms of frequency or time functions.
  • the bridge between these two avenues of approach is the Fourier Integral which may be thought of as a mathematical device for expressing a time function in terms of steadystate phenomena.
  • a more specific object ofthis. invention is to 7 provide novel techniques and apparatus for the include one or more cathode ray tubes and aux:
  • iliary circuits is designed to simulate a given network response in accordance with a time function concept.
  • a device of this type is known, in the art as a transversal filter, and is adapted to produce a modified output signal by a series of operations which include the following:
  • a rid comprising elements which are obliquely is,- Posed in a pl ne p rallel to the plane of the target and Space varied in accordance with a pre determined weighting function.
  • Successive target elements are adapted to be discharged at regus larintervals and. the charge collected by means of a commutative brush.
  • 'A second embodiment disclosed includes a cathode ltay tube having a recording beam and a collooting am which m v in synchro ism h recording beam, which is in ens y varie by he impressed junction, covers the target with a series of parallel vertical tra s from l ft to righteopositing charge one mu tilemcnt pr mary ta get comprising a plurality of shielded plates and connected resistances having values which are arranged in space configura ion in acc r e w h predetermined weigh ng uncti n-
  • the recording eam ay al env natively take the vform of a vertical ribbon beam coextensive with the vertical dimension of the tar et or a spo b am with a rapid vert weep-
  • the increments of charge stored on'the primary target elements are discharged in prearranged seriesand integrated in the output as the collectine beam
  • the plateresistance target array is replaced by an array of storage elements having vertical cross-sectional dimensions which vary in accordance with the weighting function.
  • the target comprises condenser elements having dielectrics which vary in accordance with the weighting function.
  • Figs. 1a to 1e are a seriesv of diagrams illustrating the theory of operation of transversal filters
  • Figs. 2a and 2b show graphical interpretations of two specific filter characteristics
  • Fig. 3a showsvan embodiment of the electron beam tube filter in which the charge deposited on the target is weighted by means of an interposed grid having variably spaced elements
  • Fig. 3b shows an enlarged view of the grid 32! of Fig. 3a;
  • Fig. 3c shows an impulse-response curve in accordance with which the grid 321 is fashioned; and
  • Fig. 3d illustrates the intensity variations in a beam passing over the grid 321 of Fig. 3a;
  • Fig. ea shows an electron beam tube filter utilizing a recording beam which scans a primary target array moving in synchronism with a collecting beam which scans a secondary target array.
  • the primary target comprises an array of shielded plates andconnected resistances, arranged according to value in predetermined space configuration.
  • the primary tar- 'get comprises an array of storage elements having a shaped vertical cross-sectional dimension and arranged in predetermined configuration.
  • the time-rate-of-change j of the transfer indicial admittance defined above is a function of time designated g(t).
  • the function g(t) is variously referred to in the specification and claims hereinafter as the impulse response" or merely the g-function of a system. Further discussion and definition of certain mathematical concepts, such as that of the unit impulse, which will be relied on' in the detailed description hereinafter will be found in volume I of Transients in Linear Systems by Gardner and Barnes, John Wiley and Sons, 1942, pages 255- 263.
  • Fig. 1d assume that there is. impressed upon the network a single pulse of the sort into which the voltage wave E(t) has been subdivided. At the network output terminals 2 there now appears a function which as the pulse width approaches zero is proportional to the gfunction of the network as defined above. It
  • any other pulse of different amplitude would result in the approximate 9- function except that its amplitude would vary in proportion to the applied pulse amplitude and that moreover its time of occurrence would depend on the time of pulse application.
  • the network is subjected attheyinput I to an initial pulse at some arbitrary time, which for convenience may be called zero, and if this pulse is followed by others at specified values of time, the total response at the output terminals 2 at any later time will'be the sum of the responses which have occurred upto that time.
  • the response at any time depends upon the history of the'applied input wave, previous to the time in question so that the past history must be available at least over a time interval 1' within which the g-function is of appreciable magnitude.
  • the network can be looked .upon as a circuit for eifecting the summation-of a series of time displaced g-functions in which the individual amplitude of each of the respectivegfunctions is proportional to the corresponding time-displaced instantaneous value of the impressed voltage wave E(t). schematically indicatedin Fig. 1e.
  • Adopting a slightly different point of view one can also look upon the output wave as representing at any time a weighted history or record of the input wave where the, g-function has acted as the weighting factor. r T
  • the steady-state transfer admittance is the Fourier Transform of the unit impulse response. From a principal point of view, it is thus irrelevant whether frequency selection properties of a network are stated in terms of steady-state frequency response to sinusoidal driving forces or whether they are given as the time response to a unit impulse.
  • the frequency response is merely the spectral analysis of the time response to a unit impulse.
  • Equation 7 in principle allows g(t) to be calculated from a knowledge of the frequency spectrum of the steady-state transfer admittance, i.
  • phase shift (w) is linear and is given by the following equation:
  • Equation 11 which is roughly plotted on Fig. 2b represents an amplitude modulated carrier wave with a' carrier frequency equal to that of mid-band;
  • Fig. 3a of the drawings discloses an embodiment in which an electron beam is adapted to scan a target from left to right in a progression of parallel vertical lines, the deposited charge varying from line to line in accordance with variations in an impressed signal.
  • the record of charge deposited on the configuration of transversely arranged storage elements, which comprise the target, is weighted by' means of .a-grid interposed in the path of the beam which has its elements diagonally spaced in accordance with-a chosen g-function. Increments of charge are collected and integrated in the output by means of a commutative brush which rotates in synchronism with the horizontal sweep of the beam, discharging the storage elements in succession.
  • the electron tube of the present embodiment has an enclosing glass envelope 30I, and comprises a conventional electron gun which includes the following elements; a
  • cathode 302 comprising thermoemissive material which is heated to the temperature required for electron emission by means of the filament 303 energized by the power source 304; first and second anodes 305 and 306. having small :axial apertures adapted to pass electrons forming a small-dimensional spot beam, said anodes connected at respectively different positive potentials to the power source 331, whereby the elec tron beam is focussed and accelerated by adjustment of the potential gradient; and the control grid 3.08 which is connected through the secondary winding of the input transformer 3! to the negative bias battery 309, whereby the eleccuit 3M, and the verticalsweepcircuit 3i5, which are synchronously triggered for operation by the synchronizing oscillator 3 I6.
  • the horizontal and vertical sweep circuits 3 I 4 and 3 I 5 are so designed that during each horizontal scanning period the vertical sweep voltage is amplitude varied in a series of n uniform sawteeth, corresponding to 12 vertical scanning lines, while the horizontal sweep voltage rises linearly from a minimum to a maximum voltage.
  • the horizontal sweep voltage returns rapidly to zero, and the cycle is repeated.
  • the rate of the downward vertical scanning motion is rapid comparedto the rate with which the beam moves across the target in a 'horizontaldirection.
  • the target 3 I 3 is repeatedly scanned from left to right horizontally, with ,a rapid periodic return to the left-hand edge of the target.
  • the blanking circuit 329 which is con-- nected to the horizontal and vertical sweep circuits 3 l 4 and 3I5, and to'the grid 308 adjacent the cathode 302, serves to blank the signal during each upward vertical stroke of the beam and during the rapid horizontal return from the right-hand edge of the target 3 l 3 to the left-hand edge for a repetition of the scanning cycle.
  • the target 3l3 comprises a large number'oi substantially identical elongated rectangular metal strips which are mounted transversely on the inside face of the rectangular insulating backing element 3 I8, positioned in the end of the-tube 30
  • the metal'strips 3I1 which function as condensers by virtue of their capacitance to ground, are arranged in rectangular configurat tion so that their respective horizontal length dimensions are parallel and coextensive, and so that the vertical spacing between respective elements is substantially uniform.
  • each of the metal strips, 311 Attached to each of the metal strips, 311, are the lead wires 320, whereby the strips 3
  • the operation of the motor 325 is synchronized with the operation of the sweep cir'cuits 3M. and 3l5 by connection to the synchronizing oscillator 3I6, whereby the brush 323 is caused to progress ins. counter-clockwise direction.
  • ? is periodically conducted to the output circuit across the high resistance element 326 by the rotatingbrush 32 Interposed in the path or the beam, intermediate between the electron gun and the target 3
  • the g-function grid 321 is rectangular in form, dimensionally coextensive with the target 3l3, and'comprises a series of parallel wires obliquely disposed with respect to the transverse target elements 3", the spacings between successive grid wires being varied so as to modify the flow of electrons therethrough in accordance with the desired g-function.
  • the obliquity of the wires and their respective spacings are so determined that one complete cycle of the chosen 0-- function, which may be calculated as provided hereimoefore in accordance with a, desired output response, is represented by the relative spacings between successive wires progressing along the grid in either a horizontal or vertical direction, the minimum permissible number of wires being determined by the number of target elements 3 I I;
  • go g1, g2, g3, g4, g5, and 96
  • the respectivespacings between'the grid wires are varied so as to impress on a -beam of electrons passing therethrough a pattern which varies through the above series of ofun'ction values in the order given.
  • the spacings of the grid wires also vary in accordance with the values of the complete g -function cycle, respect ve values in the same order but displaced in phase by an amount equal to'21r/n from the values in a horzontal line coinciding with the top element 3
  • n represents the total number of horizontal target elements.
  • Fig. 3a Operation of the system of Fig. 3a is as follows.
  • the beam, intensity varied by the impre sed signal Ed) as shown in Fig. 311, scans the target 3l3 from left to right through the interposed grid 32! successively laying down n-vertical columns of charge from left to right.
  • the brush 323 moves in a counter-clockwise direction, discharging the record deposited on the uppermost one of the elements 3
  • the brush 325 moves in succession of each of theelements 322 as the recordingbeam moves from left to right across the target 3
  • 1' varies'by integral values of n from 0 to (nAr) where nm is the period required to completely represent the chosen g-function.
  • the anodes 305 and 306 can be shaped and poten:
  • the primary target comprises an array of small rectangular shielded plates and attached resistances so arranged in value that the stored record of charge is weighted in accordance with the desired g -function.
  • the primary target elements are connected in predetermined series to successive elements of the secondary target, whereby through the secondary emission path provided by the collecting beam, the weighted increments of charge stored on the primary target are collected and integrated in the output in the desired order.
  • the electron beam tube -ofthe present embodiment comprises a glass envelope 40! which houses two conventional electron guns' adapted to respectively produce the recording beam and the wiping beam.
  • the recording gun comprises the cathode element M2, at ground potential, which is heated to the proper temperature'for electron emission by means of the filament 4B3 energized by the battery 404.
  • the electron beam produced by the cathode 482 is-fccussed and acceleratedby means of the potential gradient introduced between the first and second anodes 495 and 406, which are conventionally shaped to produce a, spot beam, and are held at'high positive potentials with respect to the cathode 4-02 by means of their respective connections to the power source 431.
  • the grid 40S interposed between the cathode 402 and the first anode 405 is connected through theusecondary of the input transformer All to the negative bias battery 409, and thereby serves to intensity modulate .the electron beam in accordance with the input signal which is fed into the circuit through the primary of the input transformer 4.
  • the intensity varied recording beam is directed to scan the primary target 4 Hi from left to right in a memorize of parallel vertical lines under control of respective pairs of horizontal and vertical electrostatic deflecting plates M2 and M3.
  • the vertical sweep circuit 414, to which the horizontal plates M2 are connected, and the horizontal sweep circuit 415, to which the vertical plates 413 are connected, are synchronously operated in response to the output of the sine wave oscillator M3.
  • the vertical sweep circuit 414 is designed to generate n voltage sawteeth during one linear voltage sweep of the horizontal sweep circuit M5, assuming as before, that n is the numher-of vertical scanning lines traced during one complete horizontal scan of the target from right to left.
  • the blanking circuit 434 which is conhected to the outputs of the vertical and horizon tal sweep circuits 4 and 415, is also connected to the grid 408, and functions in well-known manner to blank the signal during the upward vertical sweep of the beam, and during the horizontal return of the beam from right to left to begin a new scanning cycle.
  • a ribbon beam may be substituted for the spot beam disclosed, in which case the vertical sweep circuit 414 and the horizontal plates 412 are disconnected.
  • the primary or recording target M6 comprises a rectangular insulating backing element 420 dieposed in the end of the tube remote from the electron guns beyond the deflecting plates M2 and M3, and substantially at right angles to the recording beam in central scanning position.
  • Mounted on the insulating backing element 420 in the direction of the beam is a series of n substantially identical metallic plate; 418, arranged in a rectangular configuration comprising n vertical rows and n horizontal rows, where n is the number of points utilized to approximate the desired g-function.
  • the plates 418 are provided with shielding sides in order to lessen the emission of secondary electrons, so that each assumes the form of a tiny rectangular metal box having its open side in the direction of the, electron gun.
  • Respectively interposed in front of each of the horizontal rows of shielded plates4l8, are the grounded wires ill, which perform the function of providing a capacitance to ground. whereby charge may be stored on each of the plates M8.
  • the weighting function is introduced on the respective target elements in the form of the respective attached resistances 419, each of whchalh is successively graded in value in accordance with the ordinates of a desired g-function, which may be computed as described, in detail hereinbefore;
  • the elements M9 are so arranged that in moving from right to left along the top horizontal row of shielded plates M8, or from top to bottom along the right-hand vertical row of plates, their respective attached resistances M9 vary through the complete cycle of values representing the chosen g-function, beginning with go, each lower horizontal row representing the complete g-function shifted in phase from right to left by an amount 21r/n with respect to the row above.
  • the recording scanning beam is adapted to repeatedly scan from left to right across the target tracing one vertical scanning line on each vertical row of shielded metallic plates M8, the vertical scanning motion being so rapid compared to the F motion in a horizontal direction that for pramtical purposes the intensity of the recording beam may be assumed to be unchanged for all of the plates in each vertical row, but appreciably changed from one vertical row of recorded charge to the next succeeding one.
  • Adapted to move in horizontal synchronism with the recording beam as it scans the primary target M6, is a collecting beam which functions to scan the auxiliary target 4228.
  • the collecting beam is produced by a conven tional electron gun positioned in the same end of the glass envelope 40! as the recording-beam gun, and in such space relation thereto that the collecting beam, which may comprise a spot beam of electrons, is focussed to scan the auxiliary target 428, which is disposed beneath the primary target 416, in the same vertical plane and horizontally coextensive therewith.
  • the collecting-beam gun comprises a conventional cathode 42!, at ground potential, which is heated to the temperature for desired electron emission by means of the filament 422 connected to the energizing source 423.
  • the electron stream produced by the cathode 42] is accelerated and focussed, by means of the first and second anodes 424 and 525, into a spot beam of relatively small dimension which is .directed to scan the auxiliary target 428 in a horizontal direction under control of the vertical electrostatic deflecting plates 12?, between which it passes.
  • the vertical plates 42'! are connected to the horizontal sweep circuit 415, which also controls the horizontal motion of the recording beam.
  • the auxiliary target 428 scanned by the collecting beam, comprises an insulating backing element 430 upon which is mounted a horizontal row of 'n metallic plates, each plate positioned in respective vertical alignment with one of the n vertical rows of shielded recording plates 4 l 8 on the primary target 4 l 6, the elements 8 and 429 being so relatively positioned that as the recording beam records charge on a particular verticalrow of elements M8, the collecting beam rests on the vertically aligned one of the elements 429, progressing to the next successive one of the elements 429 as the recording beam progresses to the next successive vertical row on theprimary target M6.
  • the elements 429 comprise a metal such as caesium which is adapted for high density emission of secondary electrons in response to bombardment by the collecting
  • Each one of the secondary target elements'429 is connected in succession from left to rightto a respective one of the n horizontal rows of primary target elements, in order from top to bottom, all of the shielded metallic plates M8 and connected resistors 4 I 9 in each respective horizontal row being connected in series with the other elements in that row.
  • the collecting grid 43! Adjacent to the face of the secondary target 428 in the direction of the collecting beam, is positioned the collecting grid 43!, which is maintained at a small positive potential with respect to the target 428 by means of the bias battery 432.
  • the collecting grid 43! is connected in series with the resistor 433, across which the output of the circuit is connected.
  • the operation of the system of Fig. 4a is as follows:
  • the recording beam scans the primary target 4 l 6 tracing vertical records of charge on each of the'vertical rows of shielded plates 4I8, which record varies in a direction'from left to right as the input function. synchronously, the collectingbeam moves from left to right over the auxiliary target 428.
  • the collecting beam bombards in succession each one of the caesium elements'429, which are respectively connected to one of the horizontal rows of primary target ele ments MS, a secondary emission path is provided between the respective secondary target element 429 and the collecting grid 43L
  • A7 as with reference to the collections in the embodiment of Fig.
  • the substi+ tute primary .xta'rget -436 comprises '11. shaped metallicplates 43Imountedon the insulating backing 428", the plates 43! being coextensive horizontally, but with vertical cross-sectional dimensions which vary from right to left as the values of a choseng-function, one, for example, that varies linearly with time.
  • the shape of the chosen g-function curve from left to right is indicated by the shape of the uppermost one of the elements 431, cross-sectional shapes of the lower target elements being phase-shifted by an amount 21'r'/n from one horizontal row to the next lower one, as'described hereinbefore'with reference to previous embodiments.
  • the groundedwiresfl'l which are respectively interposed in front of each of the elements 431 perform the same function of providing capacitance toground as the wires 4
  • the shapedelements 431 are re;
  • an energy ray device comprising a ray-energized, charge-storing target, means for continually sweeping the ray across said target, means for concurrently varying the strength 'of 'said ray under the control'of the varying instantaneous amplitude of an applied signal, amultiplicity ofoutput'connections for. receiving electrical charges from said target, said output connections being individual to different t Jne increments within each of. a succession of time intervals .of predetermined length, a common output circuit coupled to receive energy from said multiplicity of output connections in con tinually repeated succession, and means including Likewise, it
  • eachof said target elements comprises a plur'ality of charge-storing sub-elements and separate'i couplings therefrom to an individually corresponding one of said output connections; the'saidcouplingsfrom each of said target ele'- ments varying inenergy-transmitting effectiveness'from one to anotherinconformity with said weighting function.
  • a sweep-circuit connected to said beam-deflecting means to control said beam to repeatedly scan said target producing a series of substantially parallel columns of charge, a signal source. connected to said oath ode-ray tube to control the deposition of charge by said beam on said target in accordance with 4 the instantaneous variations of said signal, said target comprising a plurality of charge-storing I elements-' arranged in preselected order ina; 'directio'n lateral to the direction of said beam, a multiplicity of outlets individual to difierent sets a of said charge-storing target elements in prearranged order, a common output circuit, switching means under control of said sweep circuit and operating in synchronism with the scanning motion of said beam for connecting said outlets to said output circuit in periodic succession, and means comprising said target elements for discharging elements of charge into said common output from each of said outlets which are proportional to successive values of said signal am-' plitude integrated over a given time interval and multiplied in order of time by selected values of
  • said means comprising said target elements comprise variations in the plane of said target in the shape of said target elements in accordance with selected values of said weighting function.
  • saidsw itching means comprises a source* of asec'ond beam of electrons and whichsaid outlets comprise target elements having a high- 'icoe'fiicient of secondary emission, and a second beam defiectin'gmeans connected to saidsweep circuit to control said-second beam to contact said ioutl'ets in succession, providing a secondaryemission path between" said outlets and said.
  • an energy ray dev-ice'com' prising 'a ray-energized target comprising a multiplicity of. charge-storing elements having a prearranged order in' the plane of said target ⁇ means for continually sweeping the ray across said-target; a single source of applied? signal; means for' con-currently varying the strength of said-ray under the control of .the'vary'ing instantaneous-amplitude of. said signal, a 'multiplicity;
  • An electrical translation device comprising in combination a cathode-ray tube, a source of a beam of electrons, a target interposed in the path of said beam, said target comprising a plurality of electrically insulated charge-storing components arranged along a series of substantially parallel lines in the plane of said target, an output circuit, commutating means for connecting each of said target components in successicn to said output circuit, a signal source, a scanning mechanism for moving said beam to deposit a pattern of charge on the components of said target which varies in the direction of said lines in accordance with the signal amplitude of said signal source, and means for varying the discharge into said output circuit along the line of each of said target components in accordance with a succession of values of a weighting function, the order of said values being rotated from one of said components to the next.
  • An electrical translation device comprising in combination a cathode-ray tube, a source of a beam of electrons, a target interposed in the path of said beam, said target comprising a plurality of electrically insulated charge-storing components arranged along a first series of substantially parallel lines in the plane of said target, an output circuit, commutating means for connecting each of said target components in succession to said output circuit, a signal source connected to vary the amplitude of said beam in accordance with the signals of said signal source, a scanning mechanism for moving said beam to scan said target components in a second series of parallel lines transversely disposed with respect to the lines of said firstseries, and means comprising a grid having variably spaced elements interposed between said beam source and said target'for'varying the amount of charge retarget components in succession to said output circuit, a signal source, a scanning mechanism for moving said beamto deposit a pattern of charge on the components of said target which varies in the direction of said lines in accordance with the signal amplitude of said signal source, and means for
  • An electrical translation device comprising in combination a cathode-ray tube, a source of a beam of electrons, a target interposed in the path of said beam, said target comprising a plurality of electrically insulated charge-storing elements arranged in separate parallel linear series in the plane of said target, the elements of outlets insuccession to said output circuit, a sis-'- nal source, a scanning mechanism for moving said beam to deposit a pattern of charge on the ele- I signal amplitude of said signal source, and means each of said series connected together to an outcomprising a resistance element connected be tween each of said elements and its outlet for modifying the current discharged by each said element into its'respective outlet, wherein" the; value of resistance attached toeach of the target elements in a given one of said series varies in accordance with successive values of a weighting function, the order of said values being rotated from one of said series to the next.
  • An electrical translation device comprising in combination a cathode-ray tube, a source of a first beam of electrons, a target interposed'in the path of said first beam, said target comprising a plurality of electrically insulated charge- "storing components arranged along a series of substantially parallel lines in the plane of said; target, a signal source, a scanning mechanism-1 for moving said first beam to deposit a pattern of charge on the components of said target which varies in the direction of said lines in accordance with the signal amplitude, of said signal'source, an output circuit, a source of a second beam of electrons, means for moving said; second electron beam in synchronism' with said first electron beam to provide a discharge path between each?

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US731232A 1947-02-27 1947-02-27 Electron beam tube filter Expired - Lifetime US2575393A (en)

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Application Number Priority Date Filing Date Title
FR959576D FR959576A (xx) 1947-02-27
NL138587D NL138587B (xx) 1947-02-27
NL72729D NL72729C (xx) 1947-02-27
BE480427D BE480427A (xx) 1947-02-27
US731232A US2575393A (en) 1947-02-27 1947-02-27 Electron beam tube filter
GB5095/48A GB663851A (en) 1947-02-27 1948-02-20 Apparatus for modifying electric signals in accordance with a desired function
CH271241D CH271241A (de) 1947-02-27 1948-02-27 Vorrichtung zur Umformung einer zeitlich veränderlichen elektrischen Eingangsgrösse in eine zeitlich veränderliche elektrische Ausgangsgrösse.

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US2575393A true US2575393A (en) 1951-11-20

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BE (1) BE480427A (xx)
CH (1) CH271241A (xx)
FR (1) FR959576A (xx)
GB (1) GB663851A (xx)
NL (2) NL72729C (xx)

Cited By (7)

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US2736803A (en) * 1949-03-16 1956-02-28 Hartford Nat Bank & Trust Co Frequency control
US2876380A (en) * 1949-08-17 1959-03-03 Bell Telephone Labor Inc Multielectrode traveling wave tube
US2883109A (en) * 1954-09-08 1959-04-21 Kokusai Denshin Denwa Co Ltd Device for making any desired frequency characteristic circuit
DE1220496B (de) * 1958-08-07 1966-07-07 Cutler Hammer Inc Vorrichtung zur Umformung von Signalen
US3579013A (en) * 1969-02-12 1971-05-18 Hughes Aircraft Co Cathode ray tube having radially directed commutator elements
US3753029A (en) * 1970-11-17 1973-08-14 Thomson Csf Cathode ray tube including variable delay means
US20140015530A1 (en) * 2012-07-11 2014-01-16 Pico Technologies Llc Electronics for a thin bed array induction logging system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2219021A (en) * 1939-06-30 1940-10-22 Bell Telephone Labor Inc Frequency changing
US2275224A (en) * 1940-03-06 1942-03-03 Henroteau Francois Char Pierre Multiplex communication system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2219021A (en) * 1939-06-30 1940-10-22 Bell Telephone Labor Inc Frequency changing
US2275224A (en) * 1940-03-06 1942-03-03 Henroteau Francois Char Pierre Multiplex communication system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736803A (en) * 1949-03-16 1956-02-28 Hartford Nat Bank & Trust Co Frequency control
US2876380A (en) * 1949-08-17 1959-03-03 Bell Telephone Labor Inc Multielectrode traveling wave tube
US2883109A (en) * 1954-09-08 1959-04-21 Kokusai Denshin Denwa Co Ltd Device for making any desired frequency characteristic circuit
DE1261246B (de) * 1954-09-08 1968-02-15 Kokusai Denshin Denwa Co Ltd Vorrichtung zur Herstellung eines beliebigen Frequenzganges
DE1220496B (de) * 1958-08-07 1966-07-07 Cutler Hammer Inc Vorrichtung zur Umformung von Signalen
US3579013A (en) * 1969-02-12 1971-05-18 Hughes Aircraft Co Cathode ray tube having radially directed commutator elements
US3753029A (en) * 1970-11-17 1973-08-14 Thomson Csf Cathode ray tube including variable delay means
US20140015530A1 (en) * 2012-07-11 2014-01-16 Pico Technologies Llc Electronics for a thin bed array induction logging system
US8854045B2 (en) * 2012-07-11 2014-10-07 Pico Technologies Llc Electronics for a thin bed array induction logging system

Also Published As

Publication number Publication date
GB663851A (en) 1951-12-27
BE480427A (xx)
FR959576A (xx) 1950-03-31
CH271241A (de) 1950-10-15
NL138587B (xx)
NL72729C (xx)

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